Sharing a class between multiple forms

Question

I need help figuring this question out. I\'ve tried searching and I think I might have found a solution using a Singleton Design pattern, but want to make sure.

I have a

Answer 1

Alternative to @Luiggi's solution, here's one a bit more thread conscience:

public sealed class SerialPort
{
  private static volatile SerialPort instance;
  private static object threadLock = new Object();

  /// 
Retrieve an instance of SerialPort
  public static SerialPort Instance
  {
    get
    {
      if (SerialPort.instance == null)
      {
        lock (SerialPort.threadLock)
        {
          if (SerialPort.instance == null)
          {
            SerialPort.instance == new Serialport();
          }
        }
      }
      return SerialPort.instance;
    }
  }

  private SerialPort(){}
}

Then, in practice:

SerialPort sp = SerialPort.Instance;
sp.MyMethod(...);

More information on this Singleton pattern.